Doorcheck



Nov. 19, 1929.

C. ROSENTHAL ET AL DOOR CHECK Filed March 3, 1928 m m W m M Mex BY ATTORNEYS tention over a long period of time, andin' Patented Nov. 19, 1929 g was CERF, ROSEN'IHAL Ann HUBERT McL. AnMIsrnAn, or SAN rnnivcrscofonmronnm,

ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE CONDO COMPANY, A CORPORATION" j on NEVADA I noonoirncx Application filed March}, 1928. Serial a... 258,821.

-Our present invention-is preferably em-I bodied in a yielding resistance member comprising a cylinder, a reciprocable piston, and

aconfined circulating body of liquid, said resistance member being positioned in the door frameor casing, and a presser member secured. to the door for operating said piston upon the closing of the'do'or. Obviously, however, the positions of the two members may be reversed. The cylinder and piston assembly is 'so constructed that it c'anbe mortised into the door frame-or the rear stile of the door, as the case may be, and thus concealed from view.

The object of our invention in general is to provide a simple and effective device for. checking the closing ofa door without otherwise affecting its movement. More particu- 'larly our object is to provide'such a device which will operate satisfactorily without at whichthere will be no leakage of the retarding liquid.

Other objects and vention will become apparent from the following description, which should beread with the understanding that, the construction, form, and arrangement of the several parts may be varied, withinthe limits of the claims hereto appended, without departing from the spirit of the invention as set forth in sald claims.

With thisin view our inventon will now be described fully with reference to the accompanying drawings, wherein Y Fig. 1 is a vertical central section of one embodiment of our invention.

Fig. 2 isa transverse section on 'theline 2-2 ofFig. 1. 7

Fig. 3 is a horizontal section'on the line 33 of Fig. 1, showing also the presser member. r

advantages of the in-@ which closesthe rear end of the-cylinder 2, q 7

and isheld in position by a screw plug 16.

The port 17 of the plug 15 communicates with;

Fig. 4 is a verticalsection of a second embodiment of the invention.

Fig. 5 is a transverse section on the line L 55 of Fig. 4.

- In therdrawings, the referencenumeral 1 designates a shell, in which is formed a cylinder 2. Apiston 3, operable in saidcylinder, has a stem 4' which extends forwarly through a guide sleeve or bushing 5 closing the forward end of the cylinder. Suitable packing is indicated at 6. The shell 1 also encloses a reservoir 7 in which a supply of suitable liquid 8 is contained. J? Y The shell 1 is preferably mortised .into either the door or its frame, as shown in Fig. 3, in which 9 indicates,.for example, a portion of the door frame and 10 is a portion of the door, the hinged relation of the two being indicated by the dotted lines 11. The piston 'stem4 normally projects, as shown, and is adapted to be engaged and forced inwardly, when thecdoor is closed, by a presser member 12 secured to the rear edge of said door. A spring 13, Fig. 1, forces the pistoni4- outand is guided thereby to prevent buckling. f i The pin 14 is secured to a portedp'lug 15 the'reservoir 'z by a channel18, and with the cylinder 2 through apertures'19. A valve 20 normally. closes said port 17,;said valve be,- ing carried upon'a stem 21 slidably mounted within the pin 14 and held to itsseatby a spring. 22. A- vent123 is: provided 'for the inner end of the-valve stem guide way, 1

:The cylinder 2 has a port 24 at lts'rear end,

which communicates with. a passage25 eX- tending forwardly throughthe shell between said cylinder and the reservoir.. The forward 7 end of the cylinder also has a'port26communicating with the passage 25, and anfadjust ableneedle valve 27, is provided in said 'passage between said cylinder ports; T he needle I24, passage 25, past the regulating valve 27,

valve is regulated by a screw stem having. a head'28 extending throughthe front of the shell. The forward end of the cylinder also communicates with the reservoir 7 by ports 29, Figs. 1 and 2, and saidreservoir is vented to the atmosphere by a port 30, Fig. 1, in its to r f t will now be seen that when the piston 3 is forced'rearwardly, i.e. toward the right, as

seen in Fig. 1, upon the closing ofthe door, the

liquid which fills the cyli nder 2 behind said piston, is compelled to pass through the port and through the port 26 into the forward end of said cylinder. The valve is held closed .bothby its spring 22 and by the pressure of the liquid. The forward end of the cylinder having. less volumetric capacity than the rear end, the excess liquid rises through the free ports 29,'into the reservoir 7 By regulating the'valve 27, the desired restrictive or check 1 ingeffect can be obtained.

When'the door is opened, however, andthe piston .is movedforwardlyby itsspring 18,

the valve 20 opens and allows the liquid to flow freely from the reservoir 7 into the rear ."BIldOf the cylinder through the ports 17 and '18. The liquid. int-he forward end of the cylinder is forced upward, Without resist ance, through the ports 29 into the reservoir.

Thusthere isnoresistance to the forward.

movement of the pi'ston,the reservoir 7fforming, in efiect, a free return conduit for the liquid. 1 I

It is to be noted that the liquid at all times eating and sealing the piston-and its stem and thevalve 20. It is also to be notedth at the liquid in front of the piston is never under pressure, on account of the ports 29 and vent 30, so that leakage around the stem 4 iseasily prevented by simple packing as shown at 6. I

The form of deviceshown sand 5 is'similarto that described above, except that the reservoir 71is positioned below the cylinder 2. v The regulatable passage 25 in this case may discharge directly-into the reservoir through a port 26 and the vent 30 ,is iplaced' in'the forward end of the cylinder. 1 V The operation is exactly the same as described above, except that there is normally little or no liquid in, the forward endjor the cylinder,

and therefore still less chance of leakage around the stem 4. d

In both? forms of the device the reservoir 7 contains a reserve supply of liquid which I automatically replaces the very slight'leak- V 'age oreva'poration that may occur, so that,

when once adjustedto provide the desired degree of checking effect, the device will operate for-a very long time withoutfurther at- H tention. There are noflnoving parts except the piston and stem' and the valve 20,:which *are all auto-matically lubricated by the liquid,

and these parts can be made of ample size to last almost indefinitely without wear.

We claim r 1. A door check comprising a cylinder adapted to contain a fluid; a piston operable in said cylinder to circulate said fluid; arestrictive conduit connecting the end portions of said cylinder; a second conduit outside said cylinder connecting its end portions; said second conduit being vented to the atmoshere and a valve insaid second conduit adapting it for free fluid flow i'n 'on'e direction only. i

2. A door check comprising a cylinder having a closed end and adapted to contain a fluid; a hollow piston operable in said cylinder to circulate said fluid; a stud extending from the closed end ofsaid cylinder and adapted to be received within said hollow piston; a spring within said piston and sur-' rounding said stud for moving said pistonin one direction; a conduit connecting the end portions of said cylinder and adapted for restricted fluid flow; a second conduit extend ing from the base of said stud to the opposite endportion of the cylinder; and avalve in the base of said stud for closing said second conduit to fluid flow in one direction. V

3. A door check comprising a casing having greater height than Width and adapted for insertion in the meeting face of one member of a hinge-c0nnected door and fdoorifra ne assembly, said casing having a horizontally disposed cylinder and a reservoir 1 separate therefrom and substantially in vertical alignment therewith, said reservoir havingports communicating with the end portions ofisaid cylinder and forming a fluid passage between said :end' portions means in one of said ports for restrlcting the fluld flow n one direction apresser member carried by the-meeting face of the other member of said assemblyande adapted for separable contact with said stem to move said piston in one direction; and .means for moving said piston in the other direction.

names to this specification 7 I v I CERF ROSENTHAL I N r h 7 HUBERT ARMISTEAD In testimo-nylwhereof we have signed our -only ;,a piston operablei-n said cylinder; a stem connectedwith said piston and extend- ,ing' through the'outer end of said cylinder; 

